Illuminating device



April 7, 1942,.

D'. l. CRITOPH El AL ILLUMINATING DEVICE Filed April 13, 1940 4SheetsSheet 1 O5CAR W RKlHRRDS DAVE) LCRWOPH HEN%. sc HRADER 4 A T T 2NE Y IN VE/VTORS April 7, 1942- D. l. CRITOPH Erin. 2,278,916

ILLUMINATING DEVICE Filed April 13, 1940 Sheets-Sheet 2 IN VE/VTORSObcAR W. RICHARDS DI-\V\D I. cRvroPH HENRY scuRAoER April 7, 1942. D. l.CRITOPH ETAL 2,273,916

ILLUMINATING DEVICE Filed April 13, 1940 4 Sheets-Sheet 3 IIIII i IN VEN TORS oscAR w. RICHARDS DAVlD I. CRFFOPH BY HENRY CHRIDER A TTOZNEY Aril 7', 1942.

D. l. CRITOPH EI'AL 2,278,916

ILLUMINATING DEVICE Filed April 13, 1940 4 Sheets-Sheet 4 IN VE N TOR Soscmz w. mcnakns DAVID 1. CRHOPH H RY 5. SCHRADER ATTORNEY Patented Apr.7, 1942 Es; PATENT orricE 7 2,278,916 ILLUMINATING DEVICE David I.Critoph and Henry S. Schrader, Buffalo,

I and Oscar W. Richards, Snyder, N. Y., assignors to Spencer LensEompany, Bufialo, N. Y., a corporation of New York Application April 13,1940, Serial No. 329,462

3 Claims.

This invention relates to illuminating devices and more particularly tonew and improved illuminating device which will be cooler during use.

One of the objects of the invention is to provide a new and improvedilluminating device of the character set forth.

Another object of the invention is to provide a new and improved deviceof the character set forth which will be. cooler during use allowingthe'adjustment of the device to desired position.

Another object of the invention is to provide new and improved means forventilating the interior of such a device to prevent its overheatingduring its use.

Another object of the invention is to provide simple, efiicient andeconomical means for ventilating and cooling an illuminating device.

Another object of the invention is to provide new and improved reflectoradjusting means for illuminating means.

Another object of the invention is to provide a new and improvedilluminating device wherein lumination for microscopes, it is necessarythat ing use.

the parts may be quickly and easily assembled or disassembled- Anotherobject of the invention is to provide new and improved'adjusting meansfor illuminating means.

Other objects and advantages will be apparent from the followingdescription taken in connection with the accompanying drawings. It willbe understood that many changes may be made in the details ofconstruction and arrangement of parts without departing from the spiritof the invention as expressed in the accompanying claims. We, therefore,do not wish to be limited to the exact details shown and described asthe preferred form has been shown by way of illustration only.

Referring to the drawings:

Fig. 1 is a side elevation of one form of the invention;

Fig. 2 is a front view of the form shown in Fi 1:

Fig. 3 is a sectional view taken on line 3--3 of Fig. 2;

Fig. 4 is a sectional view taken on line 4-4 of Fig. 3, looking in thedirection of -the arrows;

Fig. 5 is a sectional view taken on line 55 of Fig. 3, looking in thedirection of the arrows;

Fig. 6 is a sectional view taken on line 66 of Fig. 3, looking in thedirection of the arrows;

the device be moved to adjust the light projected therefrom into desiredfocus and adjustment with the instrument. To do this it is necessary totouch the illuminating device with the .hands and it is thereforeimportant that the device be so constructed that it will be as cool aspossible and not be too hot to adjust with the hands dur- It istherefore the primary purpose of this invention to provide anilluminating device of the typeset forth which will be cool enoughduring use that it may be adjusted and focusedto desired position.without burning the hands.

Referring more particularly to the drawings wherein similar referencecharacters designate corresponding parts throughout the several views,

the form of the device shown in Figs. 1, 2 and 3 comprises a base I onwhich are the pivot ears 2 and pivot 3. Pivotally mounted on the pivot 3is the lamp-house support 4 which is adapted to be adjusted to desiredangular position by means of the screw 5 having the thumb wheel 6 andball joint I so that by turning said thumb wheel 6 the lamphousev may beadjusted to desired angular relation with the base I.

On the support .4 is the lamphouse 8 comprising the rear housing orportion 9 and front housing or portion Ill. The rear portion 9 carriesthe lamp socket ll carrying the lamp l2, the

switch I3 which is connected in'one line ll of the current which thencontinues to the socket I l and the other line I5 of which issecureddirectly to the lamp socket II.

The rear housing 9 also carries the reflector l6 which is supported bythe support I! and may be adjusted by turning the adjusting screw I8.

Over the lamp I2 is secured the chimney mem 'ber l9 having the opening20 to allow light from Fig. 7 is a sectional view taken on line '|-1 ofFig. 3, looking in the direction of the arrows; Fig, 8 is a side view,partly in section of a modified form of lens supporting housing;

the lamp to beprojected. This chimney I9 is secured in position by thescrews 2|, and is open at its bottom surrounding the base of the lampand has the light deflecting members 22 at its 2 upper end to preventthe light from escaping but allowing a current of air to enter at thebottom and pass through said chimney member I9 and to escape between thedeflecting members 22.

The rear housing 9 also has the set screws 23 which are adapted to enterslots 24 adjacent the edges of the rim 25 on the front housing I wherebythe rear housing 9 may be secured in operative position by thentightening the said screws 23.

The front housing l0 comprises ventilating ring 41 and the extendingportion 25 containing the objective lens system 26 and holder therefor21 which is adapted to be adjusted so as to focus the light emanatingfrom the lamp I2 by the rack 28 and pinions 29 which may be adjusted byrotating either of the thumb Wheels 30.

.The interior of the device is formed so as to have a medium bright baremetal finish. The exterior of both the front housing It) and rearhousing 9 are provided with fins 3|, which are preferably finished indull black, although it has been found preferable in the commercialconstruction to finish the exterior in a black crinkled finish.

The number of said fins 3| must be balanced to the thickness of thefins, thickness of the lamphouse and diameter thereof. The fins increasethe radiating area of the surface and when they are spaced properlyallow air to circulate between them.

If desired the front housing I'D may be provided with only one lensfocusing knob or with a knurled adjusting ring 32 as shown in Figs. 8and 9.

In the form of the invention shown in Figs. 10, ll, 12 and justablestand 34 t0 the upper end of which is secured the illuminating device.

The illuminating device comprises the rear housing 35 and the fronthousing 36. The rear housing 35 is secured at its forward end by the.

screw or the like 31 to the support and the rear portion of the fronthousing is adapted to frica light trap 13, the base 33 supports theadtionally engage the front end of the rear hous- I ing to retain theparts in assembled relation.

On the rear housing 35 is the lamp socket 48 supporting the lamp 38 andadapted to be retained in operative position in the housing by the setscrew 39. The socket 48 has the ventilation grooves or openings 49,circumferential thereof to allow air to enter the body of the lampthrough said openings 49 and then pass through the housing 35 betweenthe lamp 38 and the walls of the portion 35 and then be exhaustedthrough the circumferential light trap ventilating ring 4!.

The front housing 36 contains the focusing lens system 42 adapted to beadjusted to focus the light by turning the knurled ring 43 which throughthe slot 44 and set screw 45 causes the lens system to move to focus.the light.

Adjacent its forward end, the rear housing member has the slots 45 whichare in alignment with the light trap ring 4 I.

In this form the rear and front housings are also provided on theirinner surfaces with a medium bright bare metal finish and on their outersurfaces with dull black or black crinkle finished fins as stated abovefor the other form of the invention.

It has been found that with the ventilation arrangements as shown anddescribed and with the inner surface of the.housings of a medium brightbare metal finish combined with the dark fins on the exterior of thehousing that an illuminating device may be constructed which will bemuch cooler in operation than was possible with prior art structures.

In view of the above it will be seen that we have provided simple,eflicient and economical means for obtaining all invention.

Having described our invention we claim:

1. In a device of the character described, a rear housing, a lamp insaid rear housing, a front housing in alignment with said rear housing,a lens system in said front housing in optical alignment with said lamp,the interior surface of both of said housings having a medium brightmetal finish and the exterior of said housings having a plurality offins, said exterior being of a dark color, and an overhanging flangeadjacent the edge of one of said housings and spaced from an overhangingan opening in the other of said housings to allow ventilation of theinterior'of said housings.

2. In -a device of the character described, a rear housing having anopening adjacent its forward end, a lamp in said rear housing, a fronthousing in alignment with said rear housing, a lens system in said fronthousing in optical alignment with said lamp, the interior surface ofboth of said housings having a medium bright metal finish and theexterior of said housings having a plurality of fins, said exteriorbeing of a dark color, and an overhanging flange adjacent the rear edgeof said front housing and spaced from and overhanging said opening insaid rear housing to allow ventilation of the interior of said housings.

3. In a device of the character described, a rear housing havingdiametrically opposed openings adjacent its forward end, a lamp in saidrear housing, a front housing in alignment with said rear housing, alens system in said front housing in optical alignment with. said lamp,the interior surface of both of said housings having a medium brightmetal finish and the exterior of said housings having a plurality offins, said exterior being of a dark color, and an overhanging fiangeadjacent the rear edge of said front housing and spaced from andoverhanging said diametrically opposed openings in said rear housing toallow ventilation of the interior of said housings.

OSCAR W. RICHARDS. DAVID I. CRI'IOPH. HENRY S. SCI-IRADER.

of the advantages of the

